When I noticed a lower price for tickets I booked 1/2/18 for a trip to Austin TX on 4/26/18, I contacted SW and they gave me the lower price under the same confirmation #, and put the $60 difference using that confirmation # into "Travel Funds" that would expire 1/2/19. I used this Travel Funds credit on tickets I purchased 6/6/18 for travel on 12/24/18. Again, a lower price was subsequently offered (I check when they send me their weekly "sale" emails), and I called to get the lowered price. They again put the difference of $40 into Travel Funds under the 12/24 confirmation number, BUT with the earlier expiration date (1/2/19) of those previously used funds, rather than the trip purchase date of 6/6, thereby making them total useless to me. Is this "SOP" or should I appeal to SW executives?